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administrator/components/com_akeebabackup/webpush/WebPush/Utils.php

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+<?php
+/**
+ * Akeeba WebPush
+ *
+ * An abstraction layer for easier implementation of WebPush in Joomla components.
+ *
+ * @copyright (c) 2022 Akeeba Ltd
+ * @license   GNU GPL v3 or later; see LICENSE.txt
+ *
+ * This program is free software: you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation, either version 3 of the License, or
+ * (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program.  If not, see <https://www.gnu.org/licenses/>.
+ */
+
+declare(strict_types=1);
+
+namespace Akeeba\WebPush\WebPush;
+
+use function mb_strlen;
+use function mb_substr;
+
+/**
+ * This class is a derivative work based on the WebPush library by Louis Lagrange. It has been modified to only use
+ * dependencies shipped with Joomla itself and must not be confused with the original work.
+ *
+ * You can find the original code at https://github.com/web-push-libs
+ *
+ * The original code came with the following copyright notice:
+ *
+ * =====================================================================================================================
+ *
+ * This file is part of the WebPush library.
+ *
+ * (c) Louis Lagrange <lagrange.louis@gmail.com>
+ *
+ * For the full copyright and license information, please view the LICENSE-LAGRANGE.txt
+ * file that was distributed with this source code.
+ *
+ * =====================================================================================================================
+ */
+class Utils
+{
+	public static function safeStrlen(string $value): int
+	{
+		return mb_strlen($value, '8bit');
+	}
+
+	public static function serializePublicKeyFromData(array $data): string
+	{
+		$hexString = '04';
+		$hexString .= str_pad(bin2hex($data['x']), 64, '0', STR_PAD_LEFT);
+		$hexString .= str_pad(bin2hex($data['y']), 64, '0', STR_PAD_LEFT);
+
+		return $hexString;
+	}
+
+	public static function unserializePublicKey(string $data): array
+	{
+		$data = bin2hex($data);
+
+		if (mb_substr($data, 0, 2, '8bit') !== '04')
+		{
+			throw new \InvalidArgumentException('Invalid data: only uncompressed keys are supported.');
+		}
+
+		$data       = mb_substr($data, 2, null, '8bit');
+		$dataLength = self::safeStrlen($data);
+
+		return [
+			hex2bin(mb_substr($data, 0, $dataLength / 2, '8bit')),
+			hex2bin(mb_substr($data, $dataLength / 2, null, '8bit')),
+		];
+	}
+}